After more investigation, I've found that it's not the panel driver
config that needs to be modified to invert the data polarity, but
the FIMD config.

Add the missing invert-vclk option that is required to get the display
to work correctly.

Fixes: ee37a457af1d ("ARM: dts: exynos: Add Samsung Galaxy Tab 3 8.0 boards")
Signed-off-by: Artur Weber <aweber.kernel@gmail.com>
---
 arch/arm/boot/dts/samsung/exynos4212-tab3.dtsi | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/boot/dts/samsung/exynos4212-tab3.dtsi b/arch/arm/boot/dts/samsung/exynos4212-tab3.dtsi
index d7954ff466b4..e5254e32aa8f 100644
--- a/arch/arm/boot/dts/samsung/exynos4212-tab3.dtsi
+++ b/arch/arm/boot/dts/samsung/exynos4212-tab3.dtsi
@@ -434,6 +434,7 @@ &exynos_usbphy {
 };
 
 &fimd {
+	samsung,invert-vclk;
 	status = "okay";
 };
 

-- 
2.43.0

On Fri, 05 Jan 2024 07:53:01 +0100, Artur Weber wrote:
> After more investigation, I've found that it's not the panel driver
> config that needs to be modified to invert the data polarity, but
> the FIMD config.
> 
> Add the missing invert-vclk option that is required to get the display
> to work correctly.
> 
> [...]

Applied, thanks!

[1/2] ARM: dts: exynos4212-tab3: add samsung,invert-vclk flag to fimd
      https://git.kernel.org/krzk/linux/c/eab4f56d3e75dad697acf8dc2c8be3c341d6c63e

Best regards,
-- 
Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>